javascript - 调试 jQuery AJAX 响应 : what I'm doing wrong?

Question

$.ajax({
    type: 'POST',
    url: 'place/add',
    data: {
        lat: lat,
        lng: lng,
        name: name,
        address: address,
        phone: phone,
        review: review,
        category: category
    },
    success: function(data) {
    alert(data);
    alert(data.id);
    // ......
});

第一个警报给出:{"id":"2","success":true}，但第二个警报给出:undefined

Answer 1

您需要将预期返回的数据类型指定为 JSON:

$.ajax({
    type: 'POST',
    dataType: 'json', // specifies the return type
    url: 'place/add',
    data: {
        lat: lat,
        lng: lng,
        name: name,
        address: address,
        phone: phone,
        review: review,
        category: category
    },
    success: function(data) {
        alert(data);
        alert(data.id);
        // ......
    }
});